Garrettia siamensis H. R. Fletcher

Shrubs 1-1.5(-4) m tall. Branchlets 4-angled and brown puberulent when young, becoming terete and glabrous. Petiole 1.5-5 cm, puberulent; leaf blade ovate, 4.5-8 X 2-4 cm, papery, abaxially greenish, adaxially green, both surfaces puberulent and golden glandular especially abaxially, base rounded to slightly cordate, margin serrulate, apex acuminate, veins 4-6 pairs. Cymes with up to 4 monochasial branches; peduncle 1-1.5 cm; bracts linear-lanceolate. Calyx ca. 1.5 mm, membranous. Corolla with a tube 1.5-2 mm, 2-lipped, lower lip ca. 2 mm, upper lip ca. 1 mm, pilose at insertion of filaments. Stamens slightly exserted. Schizocarp globose, 1.5-2 mm in diam., densely yellow glandular, surface reticulate, apex truncate, flattened.

SE Yunnan [Indonesia, Thailand].

Open forests on mountain slopes in calcareous soil; 600-1200 m.